Piston



l To all 'whom it may concern tons,

Patented Nov. 24, 1119.25.

. UNITI-:D STA HARRY JOHN HATEBV., OF CINCINNATI, GHIO.

` rIs'roN.

Original application lcd April 24, 1922, Serial No. 556,234. Divided and this v 22, 1923. Serial No. 676,344.

Be it known that' I, HARRY J. HATER, a citizen of the United States of America,`re slding at Cincinnati, in the county of Hamilton andStateof Ohio, tain new and useful Improvements in Pis- An o ject ofmy invention is the construction of a piston which ,will tit eiiciently in the cylinder vof an engine under all conditions.

A further objectof my invention is the construction of a -piston which, while subject to expansion and contraction, will not war ,willnot fcave in, and will not knock in t 1e cylinder.

A still further object of Imy invention is ythe construction of a piston which will properly lubricate the Wallsl o f thecylinder.

A still furtherobject is the construction 'of a piston which will not score the cylinder walls -as a result of piston pin bearings. 4

This application is a division of -application No. 556,234, of April 24,; 1922.1

Figure 1 is a side elevation of a `piston made in 'accordance with my invention;

Figure 2 is4 aside elevation with the .pis-

the expansionl of the ton turned 180 from the postion shown in Figure 1';

Figure 3 is a-side elevatlon' with the pls- Figure 4 is a -transverse section on thcy groove is slightly beveled (shown accentuated in the rawintg) at 5 to-e'nable'the oil which may reach is part of the head to drain back'through the relief 011 holes and the transverse slit. The met-al `of the .skirt vportion is cut away at 6 around the plston pin opening 7 This cut-away part 6 is keystone shaped. Four oil holes 8 are spaced around each piston pin opening within the keystone relief. Extending-from Just inside have invented cerof which thev following is a vspecilicw a solid head from which a de.

nding hol ow skirt. as the usual piston skirt portion of -the` piston has a band 124 around the inside of the skirt about half way between the lower part of the piston pin opening and the bottom of the skirt, The

Tias PATENT OFFICE-. y

is on the slit-or cut 11 does not entendy through the i band 12, as is' clearly indicated at 13. In-

stead of the skirt portion of the piston shown in Figure 1 'consisting ofresilient parts, which would'be the case if the" slit 11 were cut through the band 12 and if that slit were cut-through to the transverse slit 9, the skirt portion ces consist, as shown lin igure 1, of a-sidegwall made by the uncut portion between the upper endof the diagonal slit and theuneut band 12.-

On the piston skirt portion, yas shown in .Figure '2, a slit 14 vextends from tl1 e transverse slit diagonally to the bottom ofthe two resilient vparts 15 and 16 whichextend opposite directions. I Investigation and experimenthave shown that the results are obtained in'the con-'- Skin., resultingnn this 'nids nf an. Skirt in" strnntionnf n lpi'srnn ifthn inten nldrt on the side of the 1 piston `wh'ic receives the ton turned from the position shown in' thrust onthe pmiverA stroke has, in addition point. adjacent the transverse slit to the bottomv of the skirtl butwith the slit not cut through the entire skirt at Vsome int intermediate'the end'of the slit. lIn t 'e lform of piston disclosed, the web '12 is not outl throu h. There'4 are, therefore, resilient parts tion skirt,

of the skirt onthe t low this uncut band. This construc- [ves 4the necessary resiliency to the v utpre'vents 'the parts from caving 1n vor being pushed outward. Thev uncut band m5 stside. `'Ehe-.two slits I provide for 4lubrication by' ,causingthe tribution of oil overthe'surfaoe thepis.-

ton-thereby reducing friction! ally on the lthrust side of the piston, d

an-takjecare of the expansion and contraction of the skirt and the cylinder. Oil "is also supplied by the slits to the relief, thereby lubricating that portion of the piston directly beneath the wrist pin hole and also the wrist pin bearing surface This constrl'ic'tion of the skirt on the side of the piston which receives the thrust on the power stroke prevents destruction or injury of the pistonl and the cylinder and reduces in combination with the parts on t e opposite side of the piston a perfect acting piston.

The keystone-sha ed relief has. several purposes. Amon t eseare to drain back.

to its source all oi not necessary for lubrication which reaches the relief, and to allow for expansion of the piston due to the conventional heavy piston in bosses, not shown. It is evident that the diagonally placed sides of the keystone relief prevent scorin of the cylinder which might result if the si es were parallel with the vertical axis of the piston. The holes in the lower part of the relief drain oil back into the crank case keeping the oil in circulation.

The bevel of the head below the lower `piston ring -groove serves the purposel of eiiiciently draining the oil back to its source.

While my piston may be made of any suitable material, it is eiiciently made from aluminum or aluminum alloy.

While the, diagonal lslits are about an angle of 45.-t0 the vertical, I do not limit myself to that angle, nor vto the specific kind of slit shown.

shown ,at

`said skirt having a piston pin opening therein and s aid skirt having the metal adjacent the piston pin opening cut away or relieved in the form of a keystone. i 4

2. A piston comprising a head and a depending skirt,*said skirt having` piston pin openings therein, said skirt having the metal adjacent the piston pin openings cut away or relieved in the form of a keystone, and said skirt having oil holes in said skirt within the keystone relief.

3. A piston comprising a head and a depending skirt, said skirt having piston pin openings therein, said skirt having the metal adjacent the piston pin openings cut away or relieved in the form of a keystone, and Said skirt having oil holes in 'said skirt within the keystone relief, and having some of said oil holes placed at the lower edge of said relief., f

In testimony whereof I afiix my signature.

HARRY JOHN HATER. 

